Fuel supply means for internal combustion engines



April 23, 1935. F. c.4MocK 1,998,784

FUEL SUPPLY MEANS FOR INTERNAL COMBUSTION ENGINES Filed May 8,V 1931 Y 2Sheets-Smetv l mvENToR #mit C. oc/n April. 23, 193s. f F, C, MOCK1,998,784

FUEL SUPPLY MEANS, FOR INTERNAL COMBUSTION ENGINES Filed May a, 1951 2sheets-sheetV 2 lig 2.

INVENTOR Fim/Z 6.111061?.

, WOM/4%- Patented Apr. 23, 1935 UNITED srArEs FUEL SUPPLY MIEANS' FORINTERNAL COMBUSTION ENGINES Frank C. Mock, Montclair, N.

dix Research Corporation, East J., assignor to Ben- Orange, N. J.,

a corporation of Indiana A Application May 8, 1931, Serial No. 536,054v

2o claims. vrtol. zei-ssi This invention relates in general to fuelsupply means, and more especially to supplying fluid fuel to air in theformation of a combustible charge for internal combustion engines.

More particularly, it relates to combustible charge or mixture formationin cooperation with an instrumentality such as a rotary blower for.

the principal purpose of finely dividing, atom- 12mg and uniformlydistributing the fuel throughout the air, as an incident to movement ofthe air by the blower or the like toward the combustion chambers. Theblower in these applications of the invention, mayl serve' principallyas a charge forming or mixing and advanc- 1ng instrument or may have'thewell understood functions of a supercharger, with incidental improvementof the quality of the charge by its action upon the fuel in the presenceof the combustion supporting air.

A principal use of engines provided with superchargers is in aircraft;the invention is therefore valuable in connection with aircraft engines,and the present description is devoted principally to such applications,wherefrom the characteristics' and advantages of the inventionstructures in other uses or -adaptations will readily be understood.

A principal object of the invention is to supply liquid fuel to'thecharging blower of an engine in such a manner that the fuel is properlybroken up, atomizedand uniformly distributed through the air charge, andat the same time to avoid disadvantageous localization, condensation orre-collection of the fuel, or undesired accumulation of thefuel inliquid form on walls of the apparatus. A

Another principal object is to dispose in an advantageous manner of thefuel which frequently unavoidably redeposits or collects and hows onwall surfaces. This object is attained in accordance with the4invention, as-.generally stated, by providing in favorable locationswith reference to such collecting surfaces, means or formations by whichthe collected fuel is redelivered into the air stream in a favorablemanner.

A more particularly stated object is to cause fuelV which mayunavoidablyaccumulate in liquid form in or about such a blower, to beagain discharged from the accumulating surfaces, re-

delivered into the flowing air in a favorable manner, or reatomized andredistributed through the air flow; in brief, to cause such fuelaccumulations to be again taken up in a proper manner by the air streamand carried in the desired condition to the engine heads.

I have found that in systems of this class, inA which it is attempted toutilize the rotary distributor or blower, as a charge former, ythat isas a means for atomizing the fuel as, for example, by a simpleapplication of a fuel feeding device at or near the center of the bloweror supercharger, while the fuel is moved Youtward and atomized withample vigor, the advantages Which might be expected from this action arenot fully, or in some cases at all' satisfactorily realized. Especiallythe desired final atomization and incorporation of the fuel into the airas the charge passes away from theblower and goes to the enginecombustion chambers, is not obtained; but on the contrary, the fuelseems to issue principally, if not entirely, onsome outward wall of anouter ring or equivalent structure which receives the air delivery, atsuch low velocity that it tends chiefly to collect and fall or run tosome bottom point of the system by the action of gravity; and; ofcourse, in such case this substantial part of the fuel is not properlyincorporated into the air body. f

In one instance, rotation of a centrifugal supercharger wheel without asurrounding casing demonstrated that the fuel would indeed ily off fromthe wheel in a highly atomized state. Visual examination of the interiorwith a covering or casing in place showed that the fuel left theimpeller wheel at such high velocity that it impinged upon thesurrounding walls, to which it adhered Vby surface tension, and thenflowed along the walls rather sluggishly under the inue'nce of thevarious air currents.

This difficulty was aggravated when so-called diffuser blades were usedbetween the periphery of the 'centrifugal fan and the outer collectingchamber.

These blades are ordinarily used to create spiral passages of divergingform or increasing sectional area in order to slow down the air andconvert its high velocity and low density into lower velocity and higherdensity. In this case the fuel tended to collect on theA positive orhigh pressure sides of the diffuser blades and thence drain off into thebottom of the outer collecting ring.

'I'he invention was developed fromfrthese considerations upon the theoryor in accordance with the general concept that the just stated phenomenaor results are probably inherent in instrumentalities, such as blowers,when used for the present purpose, and that the desiied final resultshould be obtained by not endeavoring fundamentally to alter thestructure or general operation of the blower with respect to itscharacteristic action on the liquid fuel, but that associated structuresor wheel elements should be sodevised or modified that they would, so tospeak, take advantage of the blower characteristic in a. manner whichwouldv in effect correct the stated faults and produce the desiredapproximation to a, theoretically perfect mixture in the final dischargezone; (that is, the area in which the mixture is considered completed).

In attempting to make this general concept effective in one way it wasfound that the desired result is closely approximated, or attained byshaping the enclosure or passage surrounding the blower to provide agenerally conical disc form air passage, in which a part of the outerconical surface intercepts the spray from the impeller wheel; thiscollected liquid then flows along the surface to a sharp edge, which, asconveniently described, overhangs a generally annular recess which formsan eddy or whirl chamber posterior tothe edge in the general directionof air and fuel flow. In operation, the fuel previously intercepted bythe conical surface is thrown off from the sharp edge in a ne spray, butat a lower velocity than that of the Wheel tips, with the result that agreatly reduced proportion of the fuel is thrown out upon the outercontaining walls. 'I'he air passage beyond this whirl chamber issuitably shaped, with generally expanding area, to give the desiredchange of fiow rate in the air passing through; that is, to slowdown airto a speed approximate to that at which it is withdrawn from this finalmixing zone by the suction strokes of the engine pistons.

The characteristics and advantages of the invention are furthersuiciently explained in connection with the following detail descriptionof the accompanying drawings, which show certain representativeembodiments. After considering these examples, skilled persons willunderstand that many variations may be made without departing from theprinciples disclosed; and I contemplate the employment of anystructures, arrangements or modes of operation that are properly withinthe scope of the appended claims.

Fig. 1 is partly in elevation and partly in section at the axial planeof the blower wheel.

Fig. 2 is a section at 2 2 Fig. 1.

Fig. 3 is an enlarged section in an axial plane of a part of the casingstructure. i

Fig. 4 is a perspective and sectional detail" of a Shaft enclosing bodyrepresenting one embodiment of this feature.

Fig. 5 is a section in an axial plane of the blower, showing certainmodifications of the rotonand amodifed and improved fuel supply means,constituting one embodiment of this feature of the invention.

In Fig. 1, the wheel may be any known or suitable supercharger rotor,used primarily for supercharging, or disregarding the superchargingfunction more or less, may be used principally as a rotary mixer ordistributor. Usually it unavoidably and desirably has a superchargingeffect. It is sufficient hereafter to refer to this element in a broadsense as an impeller or blower,

and either term is intended to avoid any limitation as to detailstructure of this element, except as may be required bythe invention.Similarly, in describing various parts of the air passage and rotorcasing, while'the language may apply quite closely to the structureshown, it will be understood that there may be great -variation in theform or arrangement of these parts.

Ashere shown, the air passage leading to the blower includes an intakepipe 3 and an elbow 5 which is extended to form one wall 1 of the rotorcasing. The other casing Wall 9 is extended to form the principal partof the annular discharge or delivery chamber so-called with relation tothe blower, since the completed mixture is delivered. by it into thischamber. Otherwise, this chamber may be described as a collecting ring.One face of the chamber is closed by a part of the plate 1. Pipes I3 inspaced relation about the delivery chamber carry the mixture to theengine heads. In the intake pipe 3 .is a typical throttle valve |5,' andinserted in the elbow is ,an injection valve or spray valve I1,representing broadly any known or suitable means of introducing the fuelinto the air line. 'I'he valve proper .I9 is normally seated by a spring2| of suitable pressure. The injection device delivers the fuel in aconical sheath toward the blower wheel entrance. v

A pump 23 supplies fuel at proper pressure to the injection valve. Theplacing of this pump in one preferred location, or in a location whichis in some cases practically essential, that is in about the positionshown in Fig. 1, at the outward side of the supercharger, away fromengine, requires that a pump drive shaft 25 leading from a convenientrotating part of the engine must pass through a part of the air spacebetween the wheel tips and the delivery chamber. v

As shown, the portion of the shaft 25 located in such space is enclosedin a body 21 which is a part of the shaft bearing or is a. bearingsleeve support. This body 21 is later referred to as an obstructingbody, or a partially obstructing body, for reasons as will appear. As sofar described, the structure is or may be ordinary or typical.

In such a typical structure, it was found that a large proportion of thefuel was thrown off from the wheel in such manner that it collected on asurface or surfaces of outward portions of the delivery chamber orsimilar wheel enclosure, and when the s'o-called diffuser blades wereused (not here shown) there was no improvement, but re-collection of thefuel was increased or aggravated. Preceding discussion is sufficient asto these disadvantageous characteristics.

Principal features of the invention as represented by this, which is onepreferred, embodiment, are now described.

'Ihe air space onpassage 29 beyond the supercharge wheel has a formwhich may most convenientlv be-.described as conical and somewhatconverging",thev conical contour being, as previously mentioned, largelyor principally for the purpose of intercepting the spray from the wheelat a desired or favorable location. The converging characteristic is insome cases non-essential.

At a point or in 'an annular region which may best be stated asa regionwherein sucie'ntconvergence has been obtained, and also in a zone orplane (with reference to the planes of wheel rotation) which preferablyis in what may be described as a well-verhanging relation to the wheel,a casing part or specifically the wall 1 is formed to provide a sharpedge 3|, which is anterior (with respect to fluid ow) and preferably asshown immediately at, an annular recess 33, constituting a whirl oreddychamber. Also, preferably, as shown, the edge 3| is in inward pro to thefarther jecting or overhanging relation side of the channel; or, asotherwise stated, in such a projecting or overhanging relation to thesurface 35 beyond the channel, so that the main path of air flow fromand beyond the edge is presumably substantially as indicated by thebroken line 31 Fig. 3, the general character of air flow in the recessbeing probably about as indicated by the light arrows.

At or about a radial position somewhat outward from the edge andchannel, say at a position 39 which is one at which the air flowpresumably has.fllled the passage, the passage area preferably beginsand may continue to diverge (if so required) approximately as shown inFig. 1, in a manner generally conforming to the desired change ofvelocity and density of the flowing air. The, casing wall 1 is in thisexample so formed as to provide a surface ll which extends into thegeneral path of air flow somewhat more abruptly than the anteriorsurface area ofthe wall; thus the surface 4I is an example of a casingsurface or surface formation favorably located to receive and collectfuel particles. In

brief, it is a favorably located collecting surface of the characterreferred to early above. It will also be understood that`the sharp edge3iv and the whirl chamber 33 in a broad sense represent any suitablemeans for returning into the air stream in a favorable manner the fuelwhich accumulates upon the collecting surface.

The drawings are almost self-explanatory in regard to operation, in viewof previous discussion. A major part of the ymoving air and of,theentrained fuel-tends to strike .against the collecting surface di, and aconsiderable proportion 'of the fuel collects thereon and flows to theedge 3l, from which it is driven off in the form of a ne spray orpractically by an atomizing action, and at a greatly retarded speed inrelation to the air speed in that zone. The whirl chamber 33 posteriorto the projecting ange formation which carries the edge 3|, receives acertain 'part of the air,.which circulates in this chamber under the lawof eddy ow; and the air issuing therefrom along the chamber surfaceadjacent the edge, in cooperation with the more direct flow of the mainstream, causes the fuel to be blown off in a generallyinward andforwarddirection, as -approximately indicated at 43.

This fuel, moving at a relatively slow rate, is moreover introduced intothe air. stream-at a zone in which the air speed tends to become or hasbeen substantially accelerated, so that after reinfroduction of the fuelthere is less tendency to again throw it off or out of the air bodyagainst an outer' wall surface, such as theinner surface of the chamberwall 45; or, in brief, the mixture formed by reintroduction of fuel inthe described manner is naturally in .ammore stable condition than atpoints anterior to the collecting surface and discharging edge.

The particular vdesign of Fig. 1 is adapted to an engine the design,ofwhich requires a lateral offset of the outer collecting ring or deliverychamber I l', in relation to the exit annulus of the mixing space. Insuch a case it was found that there was a tendency, due to centrifugalforce, for a certain part of the fuel thrown off at the edge 3| tocollect again on some necessarily inwardly projecting or, so to speak,overhanging surface. For this reason there is in the present embodimentprovided at the positive pressure side of the passage, and preferably atthe mouth'thereof, where the air ilow issuesinto the collecting ring,

a second discharging or redistributin'g -edge 41 anterior to an annulareddy current recess or chamber 49; and the surface 5l adjacentlyanterior to the edge 41 may be considered a second fuel receiving orcollecting surface disposed in a favorable position for receiving aredeposit of fuel, while edge l1 with its eddy chamber 49 representsasecond redistributing means.

Fuel collected on the surface 5l has its speed reduced by the frictionof the wall and is blown oi from the edge 41 at a reduced speed inrelation to the general speed of air-flow, but with sufcient velocity toproduce effective atomization; and especially'this second collecting anddistributing means largely or practically entirely avoids the tendencywhich would otherwise exist in a casing design of this character toproduce an undesirable amount of fuel collection upon an outer limitingsurface such as that of wall 45.

The structure of Fig. 1, thus embodying two distinct collecting orre-collecting and redist'ributing arrangements, is an example of amultie vnecessary partially obstructing body in the air space or zone ofair now beyond the blower wheel. Since any such obstructing body tendsto collect fuel in a manner analogous to the tendency, in typicalstructures, of fuelto collect upon main casing surfaces, as quite fullyanalyzed above, theiinvention includes as an important feature, means oran arrangement by which such an obstructing body is so formed as tointerrupt the air stream and to receive the unavoidable deposit of fuel,in an advantageous manner, and also to redischarge this fuel into theair flow in a desirable way.

Thusgas shown in Figs. l, 2 and 4, the body 21 at its anteriorisid (withrelation to ow) is of approximately stream-line contour. For thispurpose the`\bdy has an enlargement 53 at. its anterior side, thesurface 55,0f which is of sub-1 stantially stream-flow form. 7 The mainsurfaces of the body extend to lines generally parallel to the shaftaxis, `at which are formed sharp edges 51; and the posterior surfaceadjacent these edges is formed to provide shallow incurved recesses 59which have a tendency or action similar to that of the eddy chamber 33.

The operation here is quite analogous to that' of the redistributingedges 3l; or d1, as sufficiently explained by the representation of fuel`is atomized by the rapidly moving air, and reenters the ow space. Thesame means may be adopted with regard to any other obstructing bodywhich may be located in the air space.

Fig. 5 illustrates one principal variation in the invention mode ormeans for collecting and redistributing fuel; that is, an expedientwhich may be substituted for the surface 4| and eddy chamber 33'Fig. 1,f or example. This represents one example of a case early .abovementioned/J' namely, one in which ythe collecting and redistributingmeans is associated with or carried by the blower wheel. Thus, an shownin Fig. 5, a plate or shroud 6| of suitable shape, usually conformingclosely to the inner surface of the adja.- cent portion of elbow 5 andplate 1, with running clearance, is secured to edges of the blower'blades 63. The posterior edge of this shroud, located substantiallyinward in relation to the general contour of the adjacent wall surface61 (at the positive pressure sideof the space) constitutes a dischargingedge analogous to the edge 3| Fig. 1; and the shroud surface 69 adjacentthe edge constitutes a collecting surface leading to the edge, andacting in a substantially similar manner to surface 4| of Fig. 1, exceptthat of course in this case the discharging edge is moving at highspeed. 'I'he fuel is discharged from the shroud edge in such manner thatit does not reach, or a major portion of 'it does not reach the adjacentstationary wall surface.

`Desirably the posterior edge surface of the shroud is beveled in amanner-indicated at 1|, this formation tending to produce the sharpdischarging edge located somewhat inwardly from the general contour ofthe adjacent casing wall.

If necessary or desirable, an annular eddy chamber such as 13 may beprovided in the wall adjacent the shroud edge 65, and will have incooperation with the edge an action analogous to that of the chamber 33and edge 4| of Fig. 1.

Of course, in some cases collecting and discharging means of this type,i. e., associated with the rotor, may be employed in combination with`collecting and discharging means of the stationary type, i. e., such asedge 3| and eddy chamber 33 of Fig. 1.

Fig. 5, also shows that when desired the other casing wall such as 9 mayhave therein adjacent the rotor blade ends an annular eddy chamberformation 15 providing also a redischarging edge 11 to dispose of fuelaccumulating on the rotor surface 19, or the adjacent stationary wallsurface leading to the discharging edge.

Now considering the full disclosure of Fig. 5, in one aspect of theinvention, it represents, more than does Fig. l, a more or lessconventional design so far as the rotor and casing are concerned, withprovision in relation to or in conjunction with the rotor and casingwalls, of invention means for properly disposing of the fuelaccumulation. l

Fig. 5 also practically represents a case in which redistributing meansmay be provided in fixed position on each of the two opposite casingwalls. This will readily be understood by simply supposing in Fig. 5that the shroud 6| is removed, Whereupon the structure will be as justdescribed, this representing one preferred embodiment of the statedcase.

Fig. 5 also illustrates a detail feature of importance, consisting in aspecial arrangement or shaping of the tip edges 8| of the rotor vanes.Thus, as shown, these edges arel sloped or curved slightly outwardlyfrom certain side edges of the blades toward the other side edges, atwhich said tip edges practically merge into the redistrbuting edge 65 ofthe shroud. The liquid fuel naturally tends to collect on the faces ofthe blades and to flow thereon to the tip edges 3| and the statedspecial formation of these edges is for the purpose of leading thisliquid along such edges to the favorably located discharging .edge 65 ofthe shroud. The law of liquid adhesion and flow is such that liquid 'ona rotating surface such as a blade surface naturally tends to run orcreep along any peripheral `edge to a radially outward-most point orlocalizing formation, such as the points at which the tip edges join ormerge into the distributing edge 6.5. Fig. 5 also illustrates principalvariations in the mode or means for initially introducing fuel into theair stream and also for effecting a substantially .equi-angulardistribution of the fuel spray in the zone in which the fuel firstclosely approaches the entrance of the blower wheel. A part of the totalair supply is in this case introduced into a tube 83 which enters elbow5 and extends toward the wheel at its axis. Fuel isvintroduced into theair tube 83 in a suitable manner, as, for example, by so-called suctionfrom a nozzle 85 centered in the tube. The discharge end of tube 83represents broadly a nozzle 0r discharge point at which the highlyfuelzed column of air is discharged in the zone of the wheel entrance.

-To effect the desired substantially uniform circular distribution ofthis rich mixture, 'I partially or practically enclose this dischargenozzle in a chamber defined by a fitting 81, which is in this instanceconnected to rotate with the wheel. The sheath or shroud consisting ofthe fitting wall 89 surrounding the tube end, is provided with aplurality of uniformly spaced slots 9| constituting rotary nozzles withsurfaces 93 directed in a favorable relation to the wheel. The fittingor chamber 81 also preferably has a flat face adjacent the nozzleformations. The rim or wall 89 of the rotary fitting tends to act as'abaille, so that the combined air and fuel issuing from the nozzles 9|impinges upon the face 95, and principally at the center or central areathereof. The proper discharge of the fuelized air at or toward thedesired central portion of the baffling area 95 is facilitated byproviding at the discharge end of tube 83 a formation or by insertingtherein a ring '91 with a generally conical inward face, acting more orless as a nozzle and especially tending by reaction upon fuel entr'ainedin the moving air to direct the fuel toward the central area of thebaflling surface 95, By this means or arrangement the combined uid andespecially the fuel content will, before it takes a motion of rotation,tend to spread equally in all directions across the face 95,.andtherefrom to be fed equally out through the slots or nozzles 9|.

The purpose 'of this initial equal distribution is to secure equalizedfinal distribution of the fuel from the tips of the wheel blades, or, inother words, by the described arrangement, uniform amounts of chargedair are caused to be introduced into each inter-blade space at theentrance, and therefore the proportions of the total fuel dischargedfrom the inter-blade spaces are equalized. This feature isadvantageously employed in conjunction with other principal features ofthe invention in some cases, or may be utilized generally in afuelsupply system employing a blower, rotary distributor orsupercharger, without regard to other features of the presentinventioniWhat is claimed is:

1. A fuel supply system for an engine comprising a rotary blower, ablower casing, an air passage leading to the casing and blower intake,means for supplying fuel in a direction generally toward the blowerintake, means providing a surface in the discharge portion of the blowercasing in overhanging relation to the blower blades and in ,a favorablelocation to receive a collection of liquid fuel from the air stream, andmeans by casing vin overhanging relation to the blower blades and in afavorable location to receive a 'collection of liquid fuel from the airstream, and means by which fuel so collected is redischarged into theair stream at a relatively reduced speed and in an atomized state, saidmeans being associated with the blower rotor.

3.. A fuel supply system comprising a rotary blower, a blower casing, anair passage leading to the casing and blower intake, means for supplyingfuel in a direction generally toward the blowerintake, means in thedischarge portion of the casing providing a whirl chamber having asurface in overhanging relation to the blower blades and in a favorablelocation to receive a collection of liquid fuel from the airstream, andmeans'by which fuel sov collected is redisoharged into the air streamata relatively reduced speed and in an atornized state; said means beingstationary in relation to the blower rotor.

4. In a fuel supply system of general character described, a rotaryblower, an air passage leading to the blower, means for supplying fuelgenerally toward the blower entrance, a blower casing having a whirlchamber with a projecting surface in a position to receive a liquid fueldeposit, and adjacent means whereby the deposited. fuel is redeliveredinto the air body at relatively low velocity and in substantiallyatomized condition, said surface having a posterior discharging edge,the surface edge and chamber together with the air flow cooperating toldrive fuel collected on the surface from the edge into the air streamin substantially atomized state and at a reduced velocity.

5. In a fuel supply system of general character described, a rotaryblower, an air passage leading to the blower, means for supplying fuelgenerally toward the blower entrance, a blower casing hav' ing a whirlchamber with a projecting surface in a position to receive a liquid fueldeposit, and adjacent means whereby the deposited fuel is redeliveredinto the air body at relatively low velocity and in substantiallyatomized condition, the air space beyond said surface being of generallyexpanding form producing substantial air speed reduction in the zone inwhich the fuel is reintroduced into it.

6. In a fuel supply system of general character described, a rotaryblower, an air passage leading to the blower, means for supplying fuelgenerally toward the blower entrance, a blower casing having a whirlchamber with a projecting surface in a position to receive a liquid fueldeposit, and adjacent means whereby the deposited fuel is redeliveredinto the air body at relatively low velocity and in substantiallyatomzed condition, the casing being formedto provide an air spaceintermediate the blower and an outer collecting zone which is ofgenerally conical disc form.

7. In a fuel supply system of -general character described, a rotaryblower, an air passage leading to the blower, means for supplying fuelgenerally toward the blower entrance, a blower casing having an annularrecessed whirl chamber with a surface in a position to receive a liquidfuel deposit, and adjacent means Awhereby the deposited fuel isredelivered into the air body at relatively low velocity' and insubstantially atomized condition, the casing being formed'to provide anair space intermediate the blower and an outer collecting zone which isof generally conical -disc form ,with an area restriction adjacent saidedge, the casing being shaped to provide an air space ofgenerally-conical disc form leading to an annular discharge chamber inlaterally offset position.

8. In a fuel supply system of general character described, a rotaryblower, an air passage' leading to the blower, means for supplying fuelgenerally toward the blower entrance, a blower casing having an annularrecessed whirl chamber with a surface in a position to receive a liquidfuel deposit, and adjacent means whereby the deposited fuel isredelivered into the air body at relatively low velocity and insubstantially atomized condition, the collecting surface being ingenerally overhanging relation to the rotor periphery.

9. In a fuel supply system o f general character described, a rotaryblower, an air passage leading to the blower, means for supplying fuelgenerally toward the blower entrance, a blower casing having a wall witha surface in a position to.

receive a liquid fuel deposit, and adjacent means whereby the depositedfuel is redelivered into the air body at relatively low velocity and insubstantially atomized condition, the casing being formed to provide anair space intermediate the blower and an outer collecting zone which isof generally conical disc form with an area restriction adjacent saidedge, the casing being shaped to provide an air space leading to anannular dischargechamber, a casing wall having substantially at theentrance of said air space into said discharge chamber a fuel collectingsurface in generally projecting relation to air flow and terminating ina fuel discharging edge.

10. In a fuel supply system of general character described, a rotaryblower, an air passage leading to the blower, means for supplying fuelgenerally toward ,the blower entrance, a blower casing having a wallwith a surface in a position to receive a liquid fuel deposit, andadjacent means whereby the deposited fuel is redelivered into the airbody at relatively low velocity and in substantially atomized condition,the casing being formed to provide an air space intermediate the blowerand an outer collecting zone which is of generally conical disc formwith an area restriction adjacent said edge, the casing being shaped toprovide an air space leading to an annular discharge chamber, a casingwall substantially at the entrance of said air space into said dischargechamber a, fuel collecting surface in generally projecting relation toair flow and' terminating in a fuel discharging edge, and posteriorlyadjacent said edge an annular eddy chamber.

, 11. A fuel supply system for general purposes described, comprising anair passage, fuel supply means, and a blower rotor in the passage, ablower casing and a plate carried by the rotor and forming an airpassage wall, said wall having a liquid fuel collecting surface with adischarge edge from which collected fuel is blown again into the air-stream in atomized condition, the passage having posteriorly adjacentsaid discharge edge an annular eddy chamber formed in the casing.

' l2.A A fuel supply system for purposes described, comprising a blowerrotor, a rotor casing, and a partially obstructing body in the air spaceoutside the rotor,l said body being enlarged at its anterior side inrespect to flow direction, said enlargement and the body generally beingof substantially stream-line contour.

13. A fuel supply system for purposes described, comprising a blowerrotor, a rotor casing,

having l and a partially obstructing body in the air space outside therotor, the body being of streamline contour and having at its posteriorside a fuel redistributing edge.

14. A fuel supply system for purposes described, comprising a blowerrotor, a rotor casing, and a partially obstructing body in the air spaceoutside the rotor, the body being of streamline contour and having atits posterior side and at opposite locations thereof substantiallyparallel fuel redistributing edges.

15. A fuel supply system for purposes described, comprising a blowerrotor, a rotor casing, and a partially obstructing body in the air spaceoutside the rotor, the body having at its posterior side a fuelredistributing edge, and also having adjacent said edge an eddy flowrecess.

16. A fuel supply system for purposes described, comprising a blowerrotor, a rotor casing, and a partially obstructing body in the air spaceoutside the rotor, the body having at its posterior side and at oppositelocations thereof substantially parallel fuel redistributing edges, andalso having adjacent edges eddy flow promoting depressions.

l'7. The structure defined in claim 13 with the laddition of a fuelsupply pump at one side of the casing, and a pump drive shaft passingthrough said body.

18. A fuel and air supply system for an engine comprising a blower, acasing therefor having walls forming a discharge passage, one of saidwalls being inclined to the axis of the blower to overhang the same andhaving means formed.

therein for collecting liquid fuel and causing an eddy current of air,said means being adapted to deliver the collected liquid fuel to the airstream flowing along the Wall.

19. A fuel and air supply system for an engine comprising a blower, acasing therefor, an air passage leading to the casing and blower intake,means for supplying liquid fuel into the air passage, said casing havingwalls forming a fuel and air discharge passage from the ower, one ofsaid 1 walls having a protuberance thereon extending l within thedischarge passageway, said protuberance having a curved recess formedtherein terminating in a sharp edge extending in the direction of ow forcollecting liquid fuel and delivering it to the air ow within thedischarge passage.

20. A fuel and air supply system comprising a FRANK C. MOCK.

